Fluorine lined check valve is one of the fluorine lined valves, fluorine lined check valve (also known as check valve) the role of this type of valve is to only allow the medium to flow in one direction, and prevent the direction of flow. Usually the valve works automatically. The disc opens under the action of fluid pressure flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self-recentdisc of the disc act on the seat to cut off the flow.